src: p2p: add exception spec to throwing destructors

The destructors get a noexcept(true) spec by default, but these
destructors in fact throw exceptions. An alternative fix might be to not
throw (most if not all of these throws are non-essential
error-reporting/logging).

src/p2p/connection_basic.cpp

@@ -167,7 +167,7 @@ connection_basic::connection_basic(boost::asio::io_service& io_service, std::ato
 	//boost::filesystem::create_directories("log/dr-monero/net/");
 }
 
-connection_basic::~connection_basic() {
+connection_basic::~connection_basic() noexcept(false) {
 	string remote_addr_str = "?";
 	m_ref_sock_count--;
 	try { remote_addr_str = socket_.remote_endpoint().address().to_string(); } catch(...){} ;

src/p2p/connection_basic.hpp

@@ -103,7 +103,7 @@ class connection_basic { // not-templated base class for rapid developmet of som
 		// first counter is the ++/-- count of current sockets, the other socket_number is only-increasing ++ number generator
 		connection_basic(boost::asio::io_service& io_service, std::atomic<long> &ref_sock_count, std::atomic<long> &sock_number);
 
-		virtual ~connection_basic();
+		virtual ~connection_basic() noexcept(false);
 
 		// various handlers to be called from connection class:
 		void do_send_handler_write(const void * ptr , size_t cb);

src/p2p/data_logger.cpp

@@ -103,7 +103,7 @@ namespace net_utils
 		_info_c("dbg/data","Data logger constructed");
 	}
 
-	data_logger::~data_logger() {
+	data_logger::~data_logger() noexcept(false) {
 		_note_c("dbg/data","Destructor of the data logger");
 		{
 			boost::lock_guard<boost::mutex> lock(mMutex);

src/p2p/data_logger.hpp

@@ -55,7 +55,7 @@ enum class data_logger_state { state_before_init, state_during_init, state_ready
 		public:
 			static data_logger &get_instance(); ///< singleton
 			static void kill_instance(); ///< call this before ending main to allow more gracefull shutdown of the main singleton and it's background thread
-			~data_logger(); ///< destr, will be called when singleton is killed when global m_obj dies. will kill theads etc
+			~data_logger() noexcept(false); ///< destr, will be called when singleton is killed when global m_obj dies. will kill theads etc
 
 		private:
 			data_logger(); ///< constructor is private, use only via singleton get_instance